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Amazon.com: Harmony Audio HA-ML152 Monolith 15" Car Stereo Competition SPL Sub 3200W Dual 2 Ohm Subwoofer : Electronics
Amazon.com: Monolith Powered Subwoofer - 10 Inch with 500 Watt Amplifier, THX Certified, Ideal for Professional Studio and Home Theater : Electronics
Amazon.com: Monolith M-15 V2 15-Inch THX Certified Ultra 1000 Watt Powered Subwoofer - Low Distortion, High Power Output, Vented HDF Cabinet, RCA and XLR Inputs, For Home Theater Systems, Black Ash Finish :